US10222583B2ActiveUtilityA1

Micro imaging system, imaging apparatus and electronic device

80
Assignee: LARGAN PRECISION CO LTDPriority: Oct 21, 2016Filed: Mar 10, 2017Granted: Mar 5, 2019
Est. expiryOct 21, 2036(~10.3 yrs left)· nominal 20-yr term from priority
Inventors:Kuan-Ming ChenHsin-Hsuan Huang
G02B 13/0035G02B 13/06G02B 5/208G02B 9/12
80
PatentIndex Score
2
Cited by
13
References
28
Claims

Abstract

A micro imaging system includes, in order from an object side to an image side: a first lens element having negative refractive power; a second lens element having positive refractive power; and a third lens element with negative refractive power having an object-side surface being concave in a paraxial region thereof. There are a total of three lens elements in the micro imaging system.

Claims

exact text as granted — not AI-modified
What is claimed is: 
     
       1. A micro imaging system, comprising, in order from an object side to an image side:
 a first lens element having negative refractive power; 
 a second lens element having positive refractive power; and 
 a third lens element with negative refractive power having an object-side surface being concave in a paraxial region thereof and an image-side surface being convex in a paraxial region thereof and at least one concave shape between the paraxial region and an off-axial region of the image-side surface thereof; 
 wherein the micro imaging system has a total of three lens elements; a central thickness of the first lens element is CT 1 , a central thickness of the second lens element is CT 2 , an axial distance between the first lens element and the second lens element is T 12 , a focal length of the micro imaging system is f, a curvature radius of the object-side surface of the third lens element is R 5 , a curvature radius of the image-side surface of the third lens element is R 6 , and the following conditions are satisfied:
   0.10< CT 2/ CT 1<1.80; 
   0.45< T 12/ f< 5.0; 
   | R 5/ R 6|<0.70. 
 
 
     
     
       2. The micro imaging system of  claim 1 , wherein the third lens element has both the object-side surface and the image-side surface being aspheric, and the third lens element has the image-side surface being convex in a paraxial region thereof. 
     
     
       3. The micro imaging system of  claim 1 , wherein the second lens element has an object-side surface being convex in a paraxial region thereof and an image-side surface being convex in a paraxial region thereof. 
     
     
       4. The micro imaging system of  claim 1 , wherein an Abbe number of the second lens element is V 2 , an Abbe number of the third lens element is V 3 , and the following condition is satisfied:
   2.0< V 2/ V 3<4.0. 
 
     
     
       5. The micro imaging system of  claim 1 , wherein the axial distance between the first lens element and the second lens element is T 12 , the focal length of the micro imaging system is f, the curvature radius of the object-side surface of the third lens element is R 5 , the curvature radius of the image-side surface of the third lens element is R 6 , and the following conditions are satisfied:
   0.60< T 12/ f< 3.5; 
   | R 5/ R 6|<0.50. 
 
     
     
       6. The micro imaging system of  claim 1 , wherein the axial distance between the first lens element and the second lens element is T 12 , an axial distance between the second lens element and the third lens element is T 23 , the central thickness of the first lens element is CT 1 , and the following condition is satisfied:
   0.30<( T 12+ T 23)/ CT 1<1.50. 
 
     
     
       7. The micro imaging system of  claim 1 , wherein an axial distance between an object-side surface of the first lens element and an image surface is TL, the focal length of the micro imaging system is f, a sum of axial distances between every two adjacent lens elements of the micro imaging system is ΣAT, a sum of central thicknesses of the first lens element, the second lens element, and the third lens element is ΣCT, and the following conditions are satisfied:
   3.80< TL/f< 10.0, 
   0.20<Σ AT/ΣCT< 0.95.
 
 
     
     
       8. The micro imaging system of  claim 1 , wherein a curvature radius of an image-side surface of the second lens element is R 4 , the central thickness of the second lens element is CT 2 , and the following condition is satisfied:
   −0.50< R 4/ CT 2<0.
 
 
     
     
       9. An imaging apparatus, comprising the micro imaging system of  claim 1  and an image sensor disposed on an image surface of the micro imaging system. 
     
     
       10. An electronic device, comprising the imaging apparatus of  claim 9 . 
     
     
       11. A micro imaging system, comprising, in order from an object side to an image side:
 a first lens element; 
 a second lens element having positive refractive power; and 
 a third lens element with negative refractive power having an object-side surface being concave in a paraxial region thereof and at least one surface of the third lens element having at least one inflection point thereon; 
 wherein the micro imaging system has a total of three lens elements; a central thickness of the first lens element is CT 1 , a central thickness of the second lens element is CT 2 , a focal length of the first lens element is f 1 , a focal length of the second lens element is f 2 , a sum of axial distances between every two adjacent lens elements of the micro imaging system is ΣAT, a sum of central thicknesses of the first lens element, the second lens element, and the third lens element is ΣCT, and the following conditions are satisfied:
   0.10< CT 2/ CT 1<1.10; 
   −1.30< f 2/ f 1<0.10;
 
   0.20<Σ AT/ΣCT< 0.95.
 
 
 
     
     
       12. The micro imaging system of  claim 11 , wherein the third lens element has an image-side surface being convex in a paraxial region thereof. 
     
     
       13. The micro imaging system of  claim 11 , wherein a focal length of the micro imaging system is f, the focal length of the second lens element is f 2 , and the following condition is satisfied:
   0< f/f 2<2.0. 
 
     
     
       14. The micro imaging system of  claim 11 , wherein the focal length of the first lens element is f 1 , the focal length of the second lens element is f 2 , and the following condition is satisfied:
   −0.75< f 2/ f 1<0.
 
 
     
     
       15. The micro imaging system of  claim 11 , wherein a curvature radius of an object-side surface of the second lens element is R 3 , a curvature radius of an image-side surface of the second lens element is R 4 , and the following condition is satisfied:
   1.50<( R 3− R 4)/( R 3+ R 4)<2.50.
 
 
     
     
       16. The micro imaging system of  claim 11 , wherein an axial distance between the first lens element and the second lens element is T 12 , an axial distance between the second lens element and the third lens element is T 23 , the central thickness of the first lens element is CT 1 , and the following condition is satisfied:
   0.10<( T 12+ T 23)/ CT 1<2.15. 
 
     
     
       17. The micro imaging system of  claim 11 , wherein a curvature radius of an image-side surface of the second lens element is R 4 , a curvature radius of the object-side surface of the third lens element is R 5 , and the following condition is satisfied:
   −100<( R 4+ R 5)/( R 4− R 5)<−5.0.
 
 
     
     
       18. The micro imaging system of  claim 11 , wherein an Abbe number of the second lens element is V 2 , an Abbe number of the third lens element is V 3 , and the following condition is satisfied:
   2.0< V 2/ V 3<4.0. 
 
     
     
       19. The micro imaging system of  claim 11 , wherein a maximum image height of the micro imaging system is ImgH, a focal length of the micro imaging system is f, and the following condition is satisfied:
   0.95< ImgH/f< 3.0. 
 
     
     
       20. The micro imaging system of  claim 11 , further comprising an aperture stop between the first lens element and the second lens element, wherein an axial distance between the aperture stop and an image-side surface of the third lens element is SD, an axial distance between an object-side surface of the first lens element and an image-side surface of the third lens element is TD, and the following condition is satisfied:
   0.10< SD/TD< 0.50. 
 
     
     
       21. A micro imaging system, comprising, in order from an object side to an image side:
 a first lens element; 
 a second lens element having positive refractive power; and 
 a third lens element having negative refractive power and at least one surface of the third lens element being aspheric; 
 wherein the micro imaging system has a total of three lens elements and all of the three lens elements are non-cemented; a central thickness of the first lens element is CT 1 , a central thickness of the second lens element is CT 2 , an axial distance between the first lens element and the second lens element is T 12 , an axial distance between an object-side surface of the first lens element and an image surface is TL, a focal length of the micro imaging system is f, a curvature radius of an object-side surface of the second lens element is R 3 , a curvature radius of an image-side surface of the second lens element is R 4 , and the following conditions are satisfied:
   0.10< CT 2/ CT 1<2.50; 
   0.10< T 12/ CT 1<3.80; 
   3.80< TL/f< 10.0; 
   0<( R 3− R 4)/( R 3+ R 4)<3.0.
 
 
 
     
     
       22. The micro imaging system of  claim 21 , wherein the third lens element has an object-side surface being concave in a paraxial region. 
     
     
       23. The micro imaging system of  claim 21 , wherein the first lens element has negative refractive power, the second lens element has the image-side surface being convex, a vertical distance between an inflection point on an image-side surface of the third lens element and an optical axis is Yp 32 , the focal length of the micro imaging system is f, and the following condition is satisfied:
   0< Yp 32/ f< 1.50. 
 
     
     
       24. The micro imaging system of  claim 21 , wherein a focal length of the third lens element is f 3 , a focal length of the first lens element is f 1 , and the following condition is satisfied:
   0.1< f 3/ f 1<0.95. 
 
     
     
       25. The micro imaging system of  claim 21 , wherein the axial distance between the first lens element and the second lens element is T 12 , the central thickness of the first lens element is CT 1 , and the following condition is satisfied:
   0.30< T 12/ CT 1<2.50. 
 
     
     
       26. The micro imaging system of  claim 21 , wherein the axial distance between the first lens element and the second lens element is T 12 , an axial distance between the second lens element and the third lens element is T 23 , the central thickness of the first lens element is CT 1 , and the following condition is satisfied:
   0.20<( T 12+ T 23)/ CT 1<1.85. 
 
     
     
       27. The micro imaging system of  claim 21 , wherein a curvature radius of an object-side surface of the third lens element is R 5 , a curvature radius of an image-side surface of the third lens element is R 6 , and the following condition is satisfied:
   | R 5/ R 6|<0.70. 
 
     
     
       28. The micro imaging system of  claim 21 , wherein an Abbe number of the second lens element is V 2 , an Abbe number of the third lens element is V 3 , and the following condition is satisfied:
   2.0< V 2/ V 3<4.0.

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